X0306 4 2012-09-06 0 0000874716 IDEXX LABORATORIES INC /DE IDXX 0001184151 DEADY CONAN R ONE IDEXX DRIVE WESTBROOK ME 04092 0 1 0 0 Corp VP, General Counsel & Sec Common Stock 2012-09-06 4 M 0 2401 77.5900 A 8399 D Common Stock 2012-09-06 4 S 0 2401 98.4522 D 5998 D Common Stock 2012-09-06 4 S 0 1120 98.7100 D 4978 D Common Stock 2012-09-06 4 S 0 880 98.8017 D 3998 D Non-Qualified Stock Option (right to buy) 77.5900 2012-09-06 4 M 0 2401 0 D 2016-02-14 Common Stock 2401 8315 D The sale price reported reflects the weighted average sale price of multiple transactions on the reported date at prices that ranged from $98.3200 to $98.4950, inclusive. The reporting person hereby undertakes to provide upon request to SEC staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price within the range. Grant of options to buy shares of common stock becomes exercisable as to 2,401 shares on 02/14/2012, 02/14/2013, 02/14/2014, 02/14/2015, and the remaining 1,112 shares on 02/14/2016. Jennifer L. Panciocco, Attorney-in-Fact for Conan R. Deady 2012-09-10